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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd4f4a61a696b22a497ea3947ecefd91f1f20968ceae7c48b8fc828126cdf4952' 
  AND token = '2R5KnJdBkf9ryjQPmXoDeQeZq54v+NMK5bqYxpRxVIY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}